ls120

2009-Nov-26, 03:02 AM

Background: As I understand it, in the 1990’s two independent teams of astronomers determined that the expansion rate of the universe appears to be accelerating, and the Hubble Constant is apparently not really “constant”, but increases with distance. The Hubble Constant is the ratio of expansion rate divided by distance and would be truly constant if the universe were expanding uniformly as many astronomers had expected.

To calculate the Hubble Constant for very distant galaxies the astronomer teams measured the redshift of type 1a supernova to determine the expansion rate of the universe, and they used supernova brightness to determine distance. They found that distant supernova were dimmer, therefore further away, than predicted by the measured redshift and the accepted value for the Hubble Constant. Since the distant supernova were further away than predicted, both astronomer teams concluded that the expansion rate of the universe must be accelerating.

Question: Could there be a different interpretation of the data as follows: Since the Hubble Constant is rate over distance (R/D), and the measured distance is greater, the value of the ratio must be smaller than expected. If that interpretation is true, the Hubble Constant is decreasing with distance, and the universe is decelerating as many predicted. Gravity is working as it should. There is no need for strange ideas like “dark energy” to explain an accelerating universe, and astronomers and physicists would be happy about that.

To calculate the Hubble Constant for very distant galaxies the astronomer teams measured the redshift of type 1a supernova to determine the expansion rate of the universe, and they used supernova brightness to determine distance. They found that distant supernova were dimmer, therefore further away, than predicted by the measured redshift and the accepted value for the Hubble Constant. Since the distant supernova were further away than predicted, both astronomer teams concluded that the expansion rate of the universe must be accelerating.

Question: Could there be a different interpretation of the data as follows: Since the Hubble Constant is rate over distance (R/D), and the measured distance is greater, the value of the ratio must be smaller than expected. If that interpretation is true, the Hubble Constant is decreasing with distance, and the universe is decelerating as many predicted. Gravity is working as it should. There is no need for strange ideas like “dark energy” to explain an accelerating universe, and astronomers and physicists would be happy about that.